This report describes the typical weather at the Chiang Mai International Airport (Chiang Mai, Thailand) weather station over the course of an average year. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Chiang Mai has a tropical savanna climate with dry winters. The area within 25 mi of this station is covered by forests (48%), croplands (19%), shrublands (19%), and grasslands (13%).
Over the course of a year, the temperature typically varies from 59Â°F to 97Â°F and is rarely below 53Â°F or above 102Â°F.
The warm season lasts from March 11 to May 6 with an average daily high temperature above 94Â°F. The hottest day of the year is April 16, with an average high of 97Â°F and low of 74Â°F.
The cold season lasts from November 18 to January 22 with an average daily high temperature below 85Â°F. The coldest day of the year is January 3, with an average low of 59Â°F and high of 83Â°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 11:00 hours of daylight; the longest day is June 20 with 13:16 hours of daylight.
The earliest sunrise is at 5:46am on June 5 and the latest sunset is at 7:06pm on July 7. The latest sunrise is at 7:00am on January 20 and the earliest sunset is at 5:45pm on November 22.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover ranges from 15% (mostly clear) to 87% (mostly cloudy). The sky is cloudiest on August 3 and clearest on February 16. The clearer part of the year begins around October 16. The cloudier part of the year begins around May 10.
On February 16, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 84% of the time, and overcast or mostly cloudy 5% of the time.
On August 3, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 89% of the time, and clear or mostly clear 9% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around August 18, occurring in 74% of days. Precipitation is least likely around January 17, occurring in 5% of days.
Over the entire year, the most common forms of precipitation are moderate rain, thunderstorms, and light rain.
Moderate rain is the most severe precipitation observed during 43% of those days with precipitation. It is most likely around July 27, when it is observed during 37% of all days.
Thunderstorms are the most severe precipitation observed during 39% of those days with precipitation. They are most likely around May 15, when it is observed during 31% of all days.
Light rain is the most severe precipitation observed during 17% of those days with precipitation. It is most likely around July 11, when it is observed during 15% of all days.
During the warm season, which lasts from March 11 to May 6, there is a 28% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of thunderstorms (62% of days with precipitation have at worst thunderstorms), moderate rain (24%), and light rain (13%).
During the cold season, which lasts from November 18 to January 22, there is a 9% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of moderate rain (57% of days with precipitation have at worst moderate rain), light rain (22%), thunderstorms (13%), and drizzle (6%).
Either snow is exceptionally unlikely to fall at any time during the year at this location or this station does not reliably report precipitation types.
The relative humidity typically ranges from 28% (dry) to 98% (very humid) over the course of the year, rarely dropping below 17% (dry) and reaching as high as 100% (very humid).
The air is driest around February 27, at which time the relative humidity drops below 33% (comfortable) three days out of four; it is most humid around September 7, exceeding 98% (very humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a year, the dew point typically varies from 50Â°F (very comfortable) to 76Â°F (very muggy) and is rarely below 41Â°F (dry) or above 79Â°F (oppressive).
There are two periods in the year that are most comfortable: The first is between January 1 and March 20 and the second is between December 6 and December 31. The air feels neither too dry nor too muggy during these periods.
Over the course of the year typical wind speeds vary from 0 mph to 12 mph (calm to moderate breeze), rarely exceeding 20 mph (fresh breeze).
The highest average wind speed of 6 mph (light breeze) occurs around March 19, at which time the average daily maximum wind speed is 10 mph (gentle breeze).
The lowest average wind speed of 2 mph (light air) occurs around January 8, at which time the average daily maximum wind speed is 6 mph (light breeze).